Opacity color

.opacity30 {
  opacity: 0.3;
  filter: alpha(opacity=30); /* For IE8 and earlier */
}

Css opacity background color

background: rgba(255, 255, 255, 0.25);

Background color with opacity

h1 {background-color:rgba(255,0,0,0.3);}

Background color opacity

rgba(51, 170, 51, .1)    /*  10% opaque green */ 
rgba(51, 170, 51, .4)    /*  40% opaque green */ 
rgba(51, 170, 51, .7)    /*  70% opaque green */ 
rgba(51, 170, 51,  1)    /* full opaque green */

Source: stackoverflow.com

Similar codes

49 votes308 views6 answers
Min and max width media query
CSS
-1 vote309 views1 answer
How to margin placeholdr text
CSS
0 vote289 views1 answer
Make previous commit master
CSS
0 vote296 views1 answer
How to use hr lines in a class css
CSS
0 vote273 views1 answer
How to save scss file
CSS
0 vote261 views1 answer
Css ol align center
CSS
0 vote302 views1 answer
Disable button outline in css
CSS
0 vote314 views2 answers
How to remove text style on td in angularjs
CSS
0 vote276 views1 answer
Storing and receiving FB
CSS
6 votes350 views5 answers
Xss
CSS